So, what I did - since clocks are allowed:
I'm gonna to assume all of us are on windows 10 for this:
If you search date and time, under related settings "date, time & regional formatting" -> change data formats
You can set it so when you click on the clock, it shows you seconds.
Another useful thing to remember - the time it takes you to say "one second" is one second. What I did, since I felt confident in my timing was pulled up the clock so it showed seconds, waited until xx:xx:x0 and then said one second, and hit submit.